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Finding the Fourth Proportional to 418,270.40, 627,175.20 and 137,643.20

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Solution

The fourth proportional to 418,270.40, 627,175.20 and 137,643.20 is: 206,388.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,270.40 : 627,175.20 = 137,643.20 : x
  2. Step 2: Convert to fraction form
    418,270.40/627,175.20 = 137,643.20/x
  3. Step 3: Cross multiply
    418,270.40x = 627,175.20 × 137,643.20
  4. Step 4: Simplify right side
    418,270.40x = 86,326,401,488.64
  5. Step 5: Solve for x
    x = 86,326,401,488.64/418,270.40
  6. Step 6: Final answer
    x = 206,388.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.